The Asymmetric Quantum Cloning Region

Understand

Quantum cloning is a fundamental protocol of quantum information theory.

• Perfect universal quantum cloning is prohibited by the laws of quantum mechanics, only imperfect copies being reachable.
• Symmetric quantum cloning is concerned with case when the quality of the clones is identical.
• In this work, we study the general case of $1 \to N$ asymmetric cloning, where one asks for arbitrary qualities of the clones.